Packera hesperia |
Packera flettii |
|
---|---|---|
serpentine groundsel, Siskiyou butterweed, western ragwort |
Flett's groundsel, Flett's ragwort |
|
Habit | Perennials, 7–15+ cm; fibrous-rooted (caudices relatively slender). | Perennials, 10–40+ cm; rhizomatous (rhizomes horizontal to erect). |
Stems | 1, glabrous or sparsely tomentose. |
1 or 2–5 (often scapiform), loosely clustered, glabrous or leaf axils sparsely hairy. |
Basal leaves | (and proximal cauline) petiolate; blades ovate, oblanceolate, or spatulate, 10–30 × 5–20 mm, bases tapering, sometimes obtuse, margins entire, subentire, or dentate. |
(and proximal cauline) petiolate; blades obovate to ovate or sublyrate, 30–60+ × 10–40+ mm, bases tapering, margins deeply dissected or pinnatifid, ultimate margins crenate to crenate-dentate. |
Cauline leaves | abruptly reduced (sessile, clasping; bractlike, entire). |
abruptly reduced or 0 (sessile; ovate to obovate, dissected or pinnatifid). |
Peduncles | bracteate (bractlets red-tinged), densely lanate-tomentose. |
inconspicuously bracteate or ebracteate, glabrous. |
Ray florets | (8–)13; corolla laminae 6–10+ mm. |
5 or 8; corolla laminae 5–10 mm. |
Disc florets | 35–50+; corolla tubes 2.5–3.5 mm, limbs 3–4 mm. |
20–30+; corolla tubes 2.5–3.5 mm, limbs 2.5–3.5 mm. |
Phyllaries | (13–)21, green (tips red or dark red), densely tomentose proximally. |
(8–)13, light green (tips yellowish), 4–7 mm, glabrous. |
Calyculi | conspicuous (bractlets narrow, red-tinged). |
0 or inconspicuous. |
Heads | 1–4+ in corymbiform arrays. |
4–10+ in subumbelliform cymiform arrays. |
Cypselae | 1.5–2 mm, glabrous; pappi 5–6 mm. |
1–1.5 mm, glabrous; pappi 4–4.5 mm. |
2n | = 46. |
= 40. |
Packera hesperia |
Packera flettii |
|
Phenology | Flowering mid Apr–mid Jun. | Flowering early Jul–mid Aug. |
Habitat | Serpentine derived soils, open woodland scrub | Exposed slopes, rocky or gravelly soils |
Elevation | 500–2500 m (1600–8200 ft) | 700–2000 m (2300–6600 ft) |
Distribution |
CA; OR
|
OR; WA
|
Discussion | Of conservation concern. Packera hesperia is known only from the Siskiyou Mountains. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Packera flettii is known from the Olympic Mountains and near Mt. Rainer in Washington and coastal mountains of Clatsop County, Oregon. It has a chromosome number unique in the genus and is not known to hybridize with other species of Packera. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 589. | FNA vol. 20, p. 587. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio hesperius, Senecio auleticus | Senecio flettii |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Wiegand) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) |
Web links |